The tax levied by this article shall not be collected in the following instances:
A salesman taking orders for and to be filled by persons paying the tax due under the provisions of the sales, use or wholesale compensating tax laws of this state on the sales made pursuant to said orders.
A salesman taking orders for merchandise to be delivered to wholesalers or manufacturers to the extent of these orders.
A salesman taking an occasional order for merchandise in this state without having a daily or weekly itinerary in the state.
Any amount representing a sale to an exempt person or an exempt commodity as provided in the sales tax law.